JLG 800A_AJ Operator Manual - Manual (Page 82)

SECTION 4 - MACHINE OPERATION
4-20 – JLG Lift – 3121209
4.16 RE-SYNCHRONIZE UPRIGHT
Releveling Valve
A pull type control valve allows the operator to adjust the
upright level cylinder if the upright is not 90° (vertical) relative
to the chassis (Refer to Figure 2.9 and Figure 2.10). This
valve is located in the tank compartment area.
Perform the following steps with the aid of an assistant:
1. Turn the key switch to the ground control position.
2. Start the engine.
3. Pull and hold the red relevel knob located next to the
main control valve. Refer to Figure 4-8.
4. Raise the tower boom 6 feet (1.8 m).
5. Release the red relevel knob.
6. Lower the tower boom fully and continue to hold down
the switch to Tower Down for an additional 20 seconds.
7. Repeat steps 3 thru 6 as necessary until the upright is
90° (vertical) relative to the chassis.
Figure 4-8. Releveling Valve